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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-37421] Include the cause for migration failure on the donor shard in the changelog</title>
                <link>https://jira.mongodb.org/browse/SERVER-37421</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, if a donor shard fails an ongoing migration, it will &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.6.8/src/mongo/db/s/migration_source_manager.cpp#L671&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;not include&lt;/a&gt; the error, which caused the failure, which makes it difficult to diagnose such failures. Whenever possible, if a migration fails we should include the reason for the failure.&lt;/p&gt;

&lt;p&gt;It might be most practical to do this in the destructor of &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.6.8/src/mongo/db/s/move_timing_helper.cpp#L63&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;MoveChunkHelper&lt;/tt&gt;&lt;/a&gt; if it is possible to read what was the last exception thrown there.&lt;/p&gt;</description>
                <environment></environment>
        <key id="612602">SERVER-37421</key>
            <summary>Include the cause for migration failure on the donor shard in the changelog</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-cluster-scalability">Backlog - Cluster Scalability</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                            <label>cs-subteam1</label>
                            <label>esha-summer-2019-neweng</label>
                            <label>max-triage</label>
                            <label>neweng</label>
                            <label>sharding-nyc-subteam1</label>
                    </labels>
                <created>Tue, 2 Oct 2018 10:18:51 +0000</created>
                <updated>Tue, 12 Dec 2023 17:03:56 +0000</updated>
                                                                            <component>Diagnostics</component>
                    <component>Sharding</component>
                                        <votes>2</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="3491598" author="josef.ahmad" created="Mon, 16 Nov 2020 14:36:44 +0000"  >&lt;p&gt;Whilst populating the error message is straightforward, I&apos;ve found out that the MoveTimingHelper destructor is unable to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/828c8c47f9e9decb63996e52141301040cd9acc3/src/mongo/db/s/move_timing_helper.cpp#L87&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;change-log&lt;/a&gt;&#160;the failure in the donor because in most (or all?) failure cases the moveChunk&apos;s operation context is in a killed state. I&apos;ve a few ideas in mind (temporarily push/pop the operation context state to allow logging; or, create a separate operation context for logging; or,&#160;&lt;em&gt;relax&lt;/em&gt; the state check when logging) but I haven&apos;t explored their feasibility. Suggestions welcome.&lt;/p&gt;</comment>
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